Massive triplet excitations in a magnetized anisotropic Haldane spin chain

Abstract

Inelastic neutron scattering experiments on the Haldane-gap quantum antiferromagnet \nd are performed at mK temperatures in magnetic fields of almost twice the critical field $H_c$ applied perpendicular to the spin cahins. Above $H_c$ a re-opening of the spin gap is clearly observed. In the high-field Néel-ordered state the spectrum is dominated by three distinct long-lived excitation branches. Several field-theoretical models are tested in a quantitative comparison with the experimental data.

4 pages, 3 figures

References in corpus (6)

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• Understanding Far-Infrared Absorption in the S=1 Antiferromagnetic Chain Compound NENP
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